I was about to change the SSD on an Esprimo Q558 and the thermal paste seemed quite dry, so I set out to replace it. Unscrewed the heatsink+fan, cleaned and replaced the thermal paste, but after putting everything back together the Esprimo won't turn on.
When I press the ON switch on there's a slow beep (abt every 3 seconds) coming out of the mb, no post and no screen. It seems like a protection is kicking in, maybe I should reset something? I noticed there's a jumper to the right of the heatsink but could find no serviving manual.
I triple-checked the new thermal paste for possible shorts, everything seems ok.